HBO and certain big studio companies like Paramount and Universal and stuff are really the only ones who worry about this stuff. But it's all completely automated from my understanding. There's just a bot watching the latest releases or most protected properties. And HBO is notorious about watching all their old stuff. There's way too much traffic for Game of Thrones for them to even try to worry about. But they still leave it up for their older stuff

All that happened was you downloaded a tagged torrent and everyone's IP got a C&D automatically sent to their ISP with their info, ISP knows it was you and passes the message along. I highly doubt your ISP cares how much data you're using, I highly doubt your computer has been compromised. They just saw your IP doing something on their end, not yours. You have nothing to worry about

I know you're gunshy at the moment, but honestly you could go right back to pirating things if you wanted. Just stay away from HBO and new released movies and games and you'd be alright. But maybe take it as a life lesson and rethink things a bit. I got one once when I went for a movie I'd never heard of but sounded interesting and had no idea it had JUST released that weekend. I downloaded it WAY too soon, and got a C&D the next week

Anymore I only download older things if I need to